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Question
An experiment showed that in a lead chloride solution, 6.21 g of lead is combined with 4.26 g of chlorine. What is the empirical formula of this chlorine? (Pb = 207; Cl = 35.5)
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Solution
| Element | % age weight | Atomic weight | Relative number of moles | Simplest ratio of atoms |
| Lead | 6.21 | 207 | `6.21/207` = 0.03 | `0.03/0.03` = 1 |
| Chlorine | 4.26 | 35.5 | `4.26/35.5` = 0.12 | `0.12/0.03` = 4 |
∴ Empirical formula of chloride = Pb1Cl4
= PbCl4
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